I have a rem 700 bdl ss 300 ultra mag with a 26''
barrel i want to bet a break put on but wanted to
cut 2'' so it would still fit in the case. how much vel loss per inch. thanks for the help.

I'll take the SEWAG that you'll loose 100 fps. Velocity loss seems to vary from 30-50 fps/inch depending on case dimensions and barrel length.

You may loose about 100fps. Why not just buy a new case?

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Mike

The ultra mag needs 26 inches of barrel, otherwise it's just a .300 winnie.

Velocity loss is hardly the issue. The more significant question is how much hearing loss will you suffer with a shortened barrel and a "cherry bomb" muffler installed on it.

Please consider the fact that the 300 Ultramag needs more than a 26 inch barrel for optimum performance. With a 28-30 inch tube this thing can bark with the big dogs. Cutting the barrel back to 24 inches will probably drop velocities to 300 wby/top 300 win mag levels. A brake is a good idea IMHO and George Vias makes a good one. I've got a fair amount of experience with this cartridge and have used it in Africa on two trips out to 350 yrds. It is a potent package!-Rob