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The Basics, Starting Out
264 IMP. Information
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<blockquote data-quote="nkyshooter" data-source="post: 2105474" data-attributes="member: 83787"><p>I don't know of a SAAMI or CIP recognized 264 Win Mag Improved - however - the "Improved" designation is a loosely accepted standard way to communicate the walls have been slightly blown out to less taper and the shoulder angle has been increased from original to 40 degrees (although some are 35 or 30 degrees). These "improved" cartridges - by their loosely accepted meaning - by definition will fire the parent/native cartridge resulting in fireformed brass.</p><p></p><p>P.O. Ackley is the first I am aware of to do this and it results in both advantages and disadvantages over the original parent cartridge.</p><p></p><p>From your description, it "sounds like" you have a 264 winmag ackley ... </p><p></p><p>You've answered 1 question already - does it safely fire standard 264 winmag - and it would seem it does since you were still intact to post <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>My experience with ackley improved cartridges is based on short action 308 based cases ... most notably the 260 Ackley ... (260 Rem Ackley Improved 40deg shoulder). My fireformed cases result in approx 6-7% more volume for powder and approx 150 feet per second additional muzzle velocity. The new dimensions also serve to reduce case stretch during subsequent firings as well as (arguably) increasing barrel life by retaining more of the "flame" from the powder burn inside the case during fireing. The down side/trade off is that is does not feed AS smoothly as a standard 260 Rem ... but if I need to feed THAT smoothly, I can still feed it standard 260 <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />.</p><p></p><p>If you reload, you can likely increase your muzzle velocity over standard 264 winmag ... but you must work up with caution and be very attentive to pressure signs and don't push the limits.</p></blockquote><p></p>
[QUOTE="nkyshooter, post: 2105474, member: 83787"] I don't know of a SAAMI or CIP recognized 264 Win Mag Improved - however - the "Improved" designation is a loosely accepted standard way to communicate the walls have been slightly blown out to less taper and the shoulder angle has been increased from original to 40 degrees (although some are 35 or 30 degrees). These "improved" cartridges - by their loosely accepted meaning - by definition will fire the parent/native cartridge resulting in fireformed brass. P.O. Ackley is the first I am aware of to do this and it results in both advantages and disadvantages over the original parent cartridge. From your description, it "sounds like" you have a 264 winmag ackley ... You've answered 1 question already - does it safely fire standard 264 winmag - and it would seem it does since you were still intact to post :) My experience with ackley improved cartridges is based on short action 308 based cases ... most notably the 260 Ackley ... (260 Rem Ackley Improved 40deg shoulder). My fireformed cases result in approx 6-7% more volume for powder and approx 150 feet per second additional muzzle velocity. The new dimensions also serve to reduce case stretch during subsequent firings as well as (arguably) increasing barrel life by retaining more of the "flame" from the powder burn inside the case during fireing. The down side/trade off is that is does not feed AS smoothly as a standard 260 Rem ... but if I need to feed THAT smoothly, I can still feed it standard 260 :). If you reload, you can likely increase your muzzle velocity over standard 264 winmag ... but you must work up with caution and be very attentive to pressure signs and don't push the limits. [/QUOTE]
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