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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
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<blockquote data-quote="Guest" data-source="post: 33826"><p>It's like Birdshooter said, check the length of both bullets and you will see that the Accubond is about 0.150" longer than the A-Frame. So, if you seat them both to the same OAL, you will encounter a significant increase in pressure since the Accubond will be seated deeper into the case. Your load for the A-Frame is already at the upper end for Re-25 according to Alliant's site.</p><p></p><p>You might want to try seating the Accubonds further out of the case as that will reduce the pressure. The throats on the Remington chambers are usually long by comparison to other manufacturers, especially with the UltraMags. Take a Dremel tool with a cut off wheel and cut a slot in an empty case (no primer or powder) from the top of the case mouth down and just into the shoulder. Sand off any burrs and then seat a bullet lightly into the neck by hand. Then chamber the dummy carefully but completely. Withdraw the bolt and the case which now will serve as a dummy cartridge which represents the OAL of that chamber with that bullet seated to touch the lands. Use a tool that measures the length from the ogive and you will be all set for that bullet and that chamber. Be sure to start your first tests with the bullets seated just off of the lands so that you don't start out by running the pressures up right away.</p><p></p><p>Retumbo and V V N-170 are showing good results with the heavier bullets in the 300 RUMs that I'm working with, right now.</p><p></p><p>Best.</p></blockquote><p></p>
[QUOTE="Guest, post: 33826"] It's like Birdshooter said, check the length of both bullets and you will see that the Accubond is about 0.150" longer than the A-Frame. So, if you seat them both to the same OAL, you will encounter a significant increase in pressure since the Accubond will be seated deeper into the case. Your load for the A-Frame is already at the upper end for Re-25 according to Alliant's site. You might want to try seating the Accubonds further out of the case as that will reduce the pressure. The throats on the Remington chambers are usually long by comparison to other manufacturers, especially with the UltraMags. Take a Dremel tool with a cut off wheel and cut a slot in an empty case (no primer or powder) from the top of the case mouth down and just into the shoulder. Sand off any burrs and then seat a bullet lightly into the neck by hand. Then chamber the dummy carefully but completely. Withdraw the bolt and the case which now will serve as a dummy cartridge which represents the OAL of that chamber with that bullet seated to touch the lands. Use a tool that measures the length from the ogive and you will be all set for that bullet and that chamber. Be sure to start your first tests with the bullets seated just off of the lands so that you don't start out by running the pressures up right away. Retumbo and V V N-170 are showing good results with the heavier bullets in the 300 RUMs that I'm working with, right now. Best. [/QUOTE]
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