Recent content by Batsin

Thanks! I suspect that the fired 277 Fury case would gain some volume, so they are very close.

Nah. You're just not using it right! :) Why, why, one time I shot over the berm and after it went all the way around the world, the bullet almost hit me in the back of the head!

He initially asked if he could rechamber his 270/308 rifle. That is a different proposition. The chamber largely depends on the action and if he will be a dedicated reloader vs someone who often uses factory ammo. Some Remington actions can't get much past 2.85" and the SAAMI spec for the...

My point was that if you already have a 270/308, the freebore/throat is likely different from that of the 277 Fury. Probably with a longer distance to the lands. Since the 270/308 is not a SAAMI standardized cartridge, it might have one of several different freebore/throat designs. Although...

The neck diameter of the 277 Fury chamber is 0.312", which might be different from your 270/308. Otherwise, the Fury case has less taper and the shoulder is farther forward than a 308, so the Fury reamer should work for you. The part in front of the case is likely different. The Fury has a...

Bolt thrust is related to the max chamber pressure pushing the "piston" of the interior diameter of the case. Running some rough numbers, the bolt thrust of the 277 Fury at 80Kpsi is about 13% LOWER than the fatter WSMs at 65Kpsi. It is also slightly less, about 4%, than a 6.5 PRC, so there...

What is the relative capacity of the the 260AI to the brass-cased 277 Fury? The Fury has a 30° neck, but the shoulder is pushed forward. How much taper is removed from the 260 in AI guise? Thanks. I have been surprised when I looked at the low taper of some recent SAAMI cartridges. For...

The interview didn't mention exactly what was causing the accuracy issues at higher pressure, so it might be something else. The fact that the initial of hybrid ammo I have seen on the SIG site used 150 grain Accubond bullets instead of a monometal is what made me wonder about nose slump.

About three weeks ago, the Ultimate Reloader YouTube channel had a video in which he pushed Alpha Munitions 308 brass to an estimated 103,000 psi in several increments, so you might be able to glean something from that. The issue with an AR10 is the bolt strength. With the XM7, the bolt is...

Ron Spomer, a hunting writer and podcaster recently had a book about 7mm cartridges published, if you are interested: " 7mm Cartridges from Around the World".

308 reamers vary somewhat. The SAAMI 308 has a section of freebore, but the dimension of a min-spec SAAMI reamer is 0.310"diameter. That is considered sloppy these days. Most of the match reamers I have seen over the last 30 years have usually had a .3085" freebore, but its length varies from...

Hopefully a true expert like Alex Wheeler will respond, but it seems that with modern chamber designs and their tighter tolerances, getting a specific jump to the lands of the barrel is no longer seen as important as it once was. Erik Cortina, one of todays top competition shooters, made a...

It is not a matter of changing tolerances. It is a simple matter of eliminating overlap. The specs and tolerances are written on each drawing and are different for each individual cartridge. It turns out that this was done for the .30 Remington and its family as far back as 1905 to prevent...

The question is "why". This is an area that is known to cause problems with production firearms and ammunition. Why continue to do it the same way as a century ago when it can be easily prevented.

Correct. Just put out guidelines that work better. Nothing needs to change on the older cartridges. New ones just won't have the same problems. Changing the overlap on tolerances does not require making the parts more accurately, it just means eliminating the overlap in the initial...