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I did a lot of testing with this chamber, found the velocity drops when using a barrel shorter than 35" Just too much powder to burn. I tried faster powder but the case is too large, that then brought up other issues, pressure spikes. It was designed to shoot heavy bullets, 414 GS custom for...

Seems some of the numbers posted are way off. 1100fps is closer at 2400yds not 3600yds at 3000yds its 995fps and that is using 3100fps as a perameter. You would have to propel the bullet at 4500fps to get close to super sonic at 2 miles. I only say this, please post accurate numbers not...

I have experienced hang fires with ball powder in cold weather. I have never seen any using Retumbo or BMG50 powders. Check your flash holes and make sure the primer is seated firm to the bottom. Also make sure the primers are fresh. I had a customer complain once and he found that the...

I hate to say what the problem prolly is..... One issue is that the dies are prolly cut for the old brass specs. Bertram brass has thinner necks and will not size properly if the die is not set for that type of brass. I had to change my tooling for the new brass. Another good technique is...

Check the run out on your ammo.

You should of contacted me if your having problems. Jamming bullets into the lands don't normally work well with magnum chambers. The best test is to start loads with the bullet just kissing the lands and work backwards. You will find most rifles with High BC bullets like them set around .010...

You can do it the same way. I use 20 grains of a fast powder, shotgun or pistol type. The filler i use is Grits. Corn meal or Cream of wheat. Dave

If the scope is rated BMG then you will be ok. I only had one issue with a rated scope early on with a 338 snipetac, a IOR. They replaced it with a new model and never had another issue. IOR told me the 338 magnums have the worst G force with a good muzzle brake. That is what causes most of...

Just to clarify a few things. The bolt face on the action is .690 Case head is .675 Case body is .680 Just a slight rebate Case is 3.050 long Barrel tennon is 1.187 x16 tpi Barrel shank size 1.350 to 1.450 is perfect 375VM2 stands for 2nd design, 40 deg shoulder I have tested this round at...

Greg, I talked with Anthony yesterday about your testing of the 414. The BC difference your seeing might be due to your over spinning the bullet in your 7.5 twist. The bullet was not designed for that much spin, 8.5 to 9" twist. They shoot extremely well in my 375 Snipetac with a 31"...

My 375 and 416 VM rifles are based on a case that is very similar to the T Rex. I am currently working on a 458 version shooting 565gn GS Custom bullets. I am looking for velocity around 2850fps with this high BC bullet. The case holds around 175gns of powder. I have these cases custom made...

Lets see if this works.

Re: System Insight The case design is being made from allmost scratch. I talked with Bertram several years ago looking for a new case larger than the 408 CT. He sugested his .585 African, similar to the Trex. I had him neck some down to 416 and hence came the 416 VM. The rifle performed...

Re: System Insight Here is the CAD print for the 375 VM case. I should have brass in about 45-60 days. Dave

Re: System Insight <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jimmy M40a2</div><div class="ubbcode-body">Man that is awesome. Sorry to keep asking question but it looks like a great package. What is the estimated supersonic range? I think I have run out of...

Re: System Insight <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jimmy M40a2</div><div class="ubbcode-body">Thanks Dave sounds promising. What is the estimated BC on those? </div></div> I believe Gerard estimated 1.300 or there abouts! Anthony might have a...

Re: System Insight <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jimmy M40a2</div><div class="ubbcode-body">Dave what twist is stabilizing those long bullets and any accuracy reports? </div></div> Right now i am using an 1:8 lawton cut rifled barrel on the 375...

Re: System Insight I am very close to the final specs on the new case. OAL will be very close to 3.380" long. Loaded round with the 414gn bullet 4.950" + or - It will work in a lawton 8000 single shot or Stiller Tac 408, you will have to do some work to the bolt face. Lawton might offer the...

Re: 408 CT barrel 1.300" breech is bare minimum. 1.350 is the smallest i will work with. Dave

Re: anone use 6al/4v titanium for custom action Ive done quite a few actions from Ti, but yes it is hard to machine. Ti dont like to let go of the chips, especially when tapping holes. I never had any problems threading the reciever tennon though. I have two large dia blanks in the shop...