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Rifles, Reloading, Optics, Equipment
Reloading
243 Win and Superformance
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<blockquote data-quote="243winxb" data-source="post: 1903285" data-attributes="member: 97793"><p>Short answer- Superformance not a powder for 55 gr bullets. Imo. </p><p></p><p>Hodgdon shows a Superformance compressed (C) load for 65 & 70 gr bullets. The 55 gr is going to need more powder to get maximum velocity. </p><p>Hodgdon data lists many powders for a 55gr. Fine ball powders use less case capacity. (Ball powder=mag primer)</p><p></p><p>Not enough case capacity using Superformance & 55 gr bullets. </p><p></p><p>Superformance's burn rate is slower then IMR4350 & IMR 4831 , not great powders even for a 70 gr. But IMR 4350 has worked for me with 68/70 gr bullets @ maximum pressures.</p><p></p><p>Barrel life may be longer, if the bullet seals the bore before the bullets base leaves the case mouth. Less hot gas blowing by the bullets on firing.</p><p></p><p>These slow powder may not fully expand the case necks on firing, till the maximum loading is reached.</p></blockquote><p></p>
[QUOTE="243winxb, post: 1903285, member: 97793"] Short answer- Superformance not a powder for 55 gr bullets. Imo. Hodgdon shows a Superformance compressed (C) load for 65 & 70 gr bullets. The 55 gr is going to need more powder to get maximum velocity. Hodgdon data lists many powders for a 55gr. Fine ball powders use less case capacity. (Ball powder=mag primer) Not enough case capacity using Superformance & 55 gr bullets. Superformance's burn rate is slower then IMR4350 & IMR 4831 , not great powders even for a 70 gr. But IMR 4350 has worked for me with 68/70 gr bullets @ maximum pressures. Barrel life may be longer, if the bullet seals the bore before the bullets base leaves the case mouth. Less hot gas blowing by the bullets on firing. These slow powder may not fully expand the case necks on firing, till the maximum loading is reached. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
243 Win and Superformance
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