milo-2
Well-Known Member
Anyone have a favorite jump number for these 30 cal bullets? Have .030" built in with magazine length.
215gr Berger Hybrids
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My 300 WSM prefers a .025" jump with the 215 hybrid.
ohiohunter
Well-Known Member
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Hybrids in general are jump tolerant
Every rifle is different. The sweet spot for my .300 WSM with 215 is .060" off the lands.
dmj
Well-Known Member
Like Rhovee said they are jump sensitive, but also believe that they are more tolerant than most. Have a 300 wsm loaded .020 off and it shoots right in that 1/2 inch mark depending on the day. Have a 300 wm loaded 3 rounds each at .020, .030., and .040. shot the.020 first, they were just little over 1/2 inch, then the .030 right at 1/2 inch, then the .040, the first 2 were almost same hole and the 3rd was touching. Both rifles consistently shoot these loads the same day after day. Difference is I only loaded one round at .020 for the 300wsm and was so happy with the results and the fact that they were repeatable and shot well at distance I never tried any thing else. So like Rhovee advised I have probably left some accuracy on the table with the wsm.
I will say, adjusting seating depth incrementally by 3 thousandths is the way to go. Larger spacing can let you skip right over where the accuracy is. I suggest starting 14-15 thou off, and basically load 3 rounds in 0.003" incriments till you get to 45-50 thou off the lands. I guarantee you'll find a place where it likes to be. Attached is an image of one my seating tests. I had 2 more groups to shoot that we further off but didn't, as I found where the bullet liked to be. Now that I found seating depth, I will load 3 rounds 1.5, 1, 0.5 gr below, ans 0.5, 1, 1.5gr above and see where it's the tightest grouping. Serval of these groups were 1/2 moa or less @ 200y. 338 rum, N570, 300 bergers @ 2890fps.
Attachments
Elkeater, I have a .300 WM Xbolt and my magazine is also limited to 3.6". I have had very good results with the Berger 210 HVLD in my gun loaded to 3.563 COAL, with a BTO of 2.886." However, yesterday I shot my first 215 Hybrid loads and am not sure those are in the ballpark. Started at 74.0 grains H1000 with a COAL of 3.571 (.129" off the lands) (BTO 2.793".) 74.5 gave best group, .52 MOA, with a velocity of 2850 f/s. 75.0g H1000 gave me a velocity of 2830 f/s for .78 MOA. For comparison, I would appreciate it if you would share with me your load data for your 215 Berger for a 3.60" COAL.
Thank you
Magnett
My Milspec 700 in 300WM is at . 050" off the lands with.25-.5MOA five shot groups. I found the 215's to be insensitive to seating depth between .020" and .070" off the lands in this rifle.
