jwp475
.375 Atomic
Posts: 1,084
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Post by jwp475 on Aug 28, 2023 16:04:51 GMT -5
Magpro is an excellent slow burn spherical powder that produces outstanding velocity in such cartridges as the 270 Winchester and the 280 Remington and 300 Win mag. These are the 3 cartridges that I have tried with Magpro so for. 24" barrel 300 win, 180 gr. TTSX 84 gr. 3154 FPS, the same load in a 29" barrel produced 3213 FPS. In the 280 Remington 65.7 grains produced 3132 FPS For the 280 I used 270 Winchester 130 load data for the TTSX since the two have nearly the same SD. I wanted to load the 280 to the same pressure as the 270 Winchester  |
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Post by x101airborne on Aug 30, 2023 15:44:36 GMT -5
I use MagPro in the 280AI and 7mm Rem Mag. A performer in 26 inch barrels.
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Magpro
Aug 30, 2023 18:02:11 GMT -5
Post by lar4570 on Aug 30, 2023 18:02:11 GMT -5
That's about the same velocity that I'm getting with the 165 TTSX in the 300 Win Mag. I may have to get some.
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Post by smirker on Sept 9, 2023 6:01:23 GMT -5
Magpro is my first choice in .270 WSM.
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Post by smirker on Sept 9, 2023 6:01:34 GMT -5
Magpro is my first choice in .270 WSM.
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Post by Aeroscout on Sept 14, 2023 20:52:02 GMT -5
I just started trying it myself. I'm trying it in a fast twist 270 Win AI. 165 ABLRs at 2800 with starting load. I don't own a chrono so had to check with distance/drop.
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Post by x101airborne on Sept 16, 2023 8:57:55 GMT -5
I just started trying it myself. I'm trying it in a fast twist 270 Win AI. 165 ABLRs at 2800 with starting load. I don't own a chrono so had to check with distance/drop. Interesting. Is there a calculator that does that for you or how does that work? |
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Post by Aeroscout on Sept 17, 2023 7:42:42 GMT -5
I just started trying it myself. I'm trying it in a fast twist 270 Win AI. 165 ABLRs at 2800 with starting load. I don't own a chrono so had to check with distance/drop. Interesting. Is there a calculator that does that for you or how does that work? I use a ballistic app like Hornady, Burris, Nikon etc. and put in the atmospheric conditions. Zero the rifle at 100 yards. Then fire a group at a long enough distance to get a measurable drop. I used 300 and 400 yards. Measure the difference between point of aim and point of impact. Start playing with the table that is generated by changing the muzzle velocity. Once the table matches the drops, you've found your general muzzle velocity. |
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