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@Rocco490 Checking with my nephew, he is a Glock aficionado Steve

Wow, 8 minutes Guess that is why ur @ActionBob :) Otherwise I would’ve jumped.

I set for a lighter load, accuracy and load density. Peep sight 50yd group using 400gn DGS and 74.3gn h4350 gives 2089fps in 23.6" barrel.

what i use is a laser, such as Wheeler, place target at know distance, say 10-20yds, max magnification and measure where each subtends lands the laser, then can estimate the reticle subtend spacing, at least get you close. Steve

for the reprint, £40-60 is a good price. 1893 First Editions, £800-1100. Steve

@RR 314 Guilty as charged:) Modern double square bridge mauser with thumb cut, flag safety, drop floorplate and military trigger, setup for an old school 416 Rigby.

@CBeck Thanks for getting me started:) Neumann wrote Elephant Hunting in East Equatorial Africa about his hunting in 1898 He made his way to Lake Rudolph in search of more elephants and was terribly gored by a cow elephant and spent about 3 months laid up there. His description is something...

416 Rigby or the Remington. The Rigby has mucho anecdotal reports, over decades, on its performance on elephant and buffalo. Unfortunately does need a large action such as the CZ from @krish

some examples of laser engraving that Tim at Matrix Gunsmithing is doing for his customers. here is my one and only rifle engraving, a tribute to Arthur Neumann.

My 495 Asquare has 2 six inch long tungsten rods In the buttstock for balance and weight. It feels “solid” when I shoulder compare to my other wood stocked rifles.

7x57 & 404J, classic hunt

i updated my QL to your input. My procedure with QL is to find published data (hopefully with psi info) of a cartridge with similar case volume, PSI rating and match velocity and pressure by adjusting the Burning Rate Factor, Ba and Weighing Factor, We (per Herr Broemel) until I match vel. and...

went thru the VIH manual for cartridges with similar PSI rating and data for n160. cartridge bullet min chg min psi load density 5.6x52R 71gn RWS SP 27.2 28692 93.2% 6.5x57R 156gn Norma SP 38.8 31523 75.0% 7x57R 160gn Sierra SPBT 42.9 32753 85.7%...

wondering if the charge was to low? I fit QL to Vih. data for the 6.5x57r as similar psi rating and case capacity and then used that for the 6.5x54 and shows the pressure is really low, around 30kpsi and vel. only 2073fps. Is the powder burning?, detonating? Did the bullet leave the case and...

I should point out than in the recoil equation, the charge gas exit velocity is 1.75x the bullet velocity and this is why folks say large volume cases usually have higher recoil. The recoil energy sensitivity to bullet weight shows this: 500J ∆FRE/∆bullet = 0.24ft-lb/grain 505 ∆FRE/∆bullet...

@zephyr, following your lead, used the Woodleigh manual and rather than using extremes, averaged the charge weights and velocities. Then, calculated the sensitivity of each to charge weight. Used 10lb rifle. 500J ∆FRE/∆chg = 0.41ft-lb/grain 505 ∆FRE/∆chg = 0.44ft-lb/grain So you can see...

Thank you @Imac45acp. He sent me the DGR barrel profile! Steve

Nah. Sorry about that, I flipped the photo. My wife is left handed and the kitchen sink faucet is always pointed to the left Steve

Brno was mentioned, here is my Brno 22lr For the Big 3:) flawless feeding with REM Thunderbolt, mild recoil, holds 5 down! Steve

Good video. Thanks Say @Mark A Ouellette, did the forearm seem short? Steve

other than Swift bullets, with the higher shot start pressure, it is the bullet seating depth that affects the pressure and use the manual that has similar bullet style and OAL. Steve

thought to compare apples to apples. Some report the Gibbs has more recoil than the Jeffery, so thought using QL, with the same loading, how do they compare in 10lb rifle. Note the Jeffery has a faster risetime but essentially, they are the same. Perhaps comparison were made with different...

@Altitude sickness Initially, actions, etc not available, as they have the hands full just building rifles (the hope is to have them offer the quarter ribs as option if makes business sense), so these were be put onto folks rifles.

Ian is sending me the barrel contour dimensions, if he every can get "un-busy" , so I can CAD up a quarter rib and banded front sight base for an aftermarket "enhancement" iron sights to their already wonderful rifle. Steve

I modelled these in QL (each fitted to Hodgdon load data) per the OP info. I look at the Pressure Impulse, i.e. the rate of pressure change with time, to see the felt recoil effects. as noted there is 5.7ft-lb more recoil energy for the winmag. Note the winmag has much faster pressure rise, fall...

I have been retired for 9yrs. One reason I go thru these cerebral exercises is to keep the mind somewhat firm:) The only wildcat so far is a 416 Cheytac and Manson had the reamer. I am considering a 505-408. Steve

thanks Dave, I wish I was less of an engineer. When I go thru the wildcat process, the bang for the buck always seem less than the effort as I want big gain but... I ran the numbers thru on the 458/300prc and gets a bit more velocity at the same pressure than the 458 winmag. 458/300prc the...

this is 300PCR necked to 458, with larger shoulder (35 whelen neck to shoulder dimension), slightly shorter body. The red is the 300PRC case overlap with the 458 chamber. Is this enough headspace intersection for fireforming? (do not want to mechanically size the brass)

this would be a nominal load below. By nature, I am not a high velocity guy. Max. velocity at the max. Lapua case pressure looks to be 2414fps. At the 450 Rigby max. pressure, 2300fps So, either a high velocity 458 or a low pressure 458. Steve

thanks for the input. the PRC necked to 458, not sure about the shoulder (did not want to increase dia). looks like same capacity as the 458 wnmag, with a bit higher pressure case. The Lapau shoulder is 30/1000 larger For the 450gn TSX, would not need to trim the cases. For the 480gn DGX,S, just...

Well, this thread, https://www.africahunting.com/threads/458-338-lapua-anyone-done-this.90956/ got me going and since winter is nearly up... Will post here the preliminary information regarding the DGR configuration, etc and cartridges characteristics. I am not a wildcat guy but with the dearth...

Or a 458 winmag, same pressure and length but with a vel. of 2350!

A more accurate comparison is the 458/338LPM to the 416 Ruger in that similar pressure, OAL, velocity but with a 0.458, 500gn bullet.

so i guess the idea would be a std length cartridge for DG with more oomph than the current 458's. @jwp475 the 458/338 normalized to the 450 Rigby Norma data, shows for the same pressure, 55102psi, the Rigby has 2159fps vs the 458/338 has 2117fps. That was near max. for the Rigby.

so i use the QL shot start for aframes. cuts back on the velocity but oh well... Drawn copper tensile strength is ~66kpsi and has huge bearing surface vs gilding metal ~32kpsi and pure copper bullets have driving bands and much less surface.

Ah… I asked if calculations or measurement, and responded was sent to lab and measured. They use thick, pure copper vs gliding.

the OAL is just at max (Ruger mag box is at ~3.45". With Hyd 480 DGX is 3.439" and with Bar 450 TSX at 3.367". The case might need to be trimmed a hair, depending upon the length after fire forming (I used 26/1000" case shrink per the wildcat wizard). The Ruger bolt is 0.690" diameter, so would...

Old Winchester Pre-64 M70 African Express Sight. Total elevation range is 40/1000". I have one a 338-06 and we added index marks to add in field adjusting. There is a set screw on the opposite side to lock the sight in place. Wisner makes them, #2,#3,#4 barrel contours

I had good luck working with Rene on QL and QD. He even got the author of QL to respond regarding Swift bullets shot start pressure.

@kreeze if okay iwth you, thinking to start another thread on the 458/338LPM in a Ruger Hawkeye platorm

Articulate man. Interesting story about Saami Linebaugh. The one line that he said “ strong evidence to support your belief” is so missing today. I have lots of 475 XTP bullets I was able to snag when they stop producing and just recently got a bunch of loaded XTP ammo to feed my 2 Linebaughs...

The Rigby case is 170/1000” longer and psi rating Is 15% lower. It’s OAL is 3.75 vs the 458/338 would be at 3.429, I guess trying to get rigby performance in a shorter package.

I guess the idea is to use a short, high pressure case.the Lapua is much shorter and a tad higher pressure. Unfortunately, it is a 416 Rigby in width:( There is a wildcat wizard that post here, perhaps he will chime in!

yeah, the length is there but the width is tough. I was looking to stuff it into a ruger hawkeye but will not work, so then the length can be longer in a or CZ or such

FYI's. 338 Lapua Mag. case head compared to 416 Rigby: Steve

@kfreeze not a bad idea. I noodled this in QD & QL, similar performance to a 450 Rigby but in a std OAL of 3.34" I used the same shoulder at the 450 Rigby. Due to the thicker web and consequently, higher pressure rating, could get to 2400fps in 24" barrel. Steve

@SkullKeeper you might also consider bulky powders n165 (similar to @DWB or h4831sc (AA manual has load data with pressure for the h4831). I use either in my 505 Gibbs. H4350 is probably a better choice, more efficient, slightly less than 100% load density. Steve

Similar to Matthew's, my 404 Jeffery "modern classic". Has same GMA std single square bridge action, full integral barrel, Wiebe "soft" buttplate, wood is a bit flashy for a working man's rifle but.... Irons only (harder to use these days but love irons and the peep helps). $6k worth of...

i think buying parts over time, then when all are gather, send to your gunsmith. This is what i did, ended up with 8 GMA actioned, wood stock rifles. GMA lead time around 1 year, and during that time, can find a nice piece of wood, maybe a barrel with integral quarter rib, trapdoor gripcap, etc...

i used two 6" long tungsten rods, 0.3125" diameter, in my 495 Asquare. It came as 12" length, my gunsmith said he would cut them again and he hates boring holes that long in a wooden stock. Anyhow, I like the balance they give and the rifle feels "solid" to me.