Help Support Long Range Hunting Forum
I also have a 284 win , but if I built another one I would definitely check and see if more free bore will help with not infringing on powder space , so you can get max performance out of the cartridge with the heavier and longer bullets . I also would go a little faster on that twist.Remember the 284 saami was designed for the win mod 88 lever and the win mod 100 auto that had a short oal.
It's no different than determining freebore for any other cartridge. He's posted the 2 reamers that he has available seems like one is going to work well for him, even if it wasn't it's no problem to use the shorter one and have the freebore cut in a second op.
we've determined he can seat 160+/- bullets with the boat tail junction above the neck shoulder junction with a COAL requirement of 3.25". 9 twist is fast enough twist to shoot 180's so I wouldn't worry about it.
I think 1-9 is on the boarder line with a 180 gr why not go faster , unless you're shooting thin jacket target bullets . Example I have 7mm in several cartridges from 1-10 1-9 -1-9.25 and 1-.75 -1.8 the 7x57 cartridge uses a faster twist 1-.75 1-8 too stabilize the long 175 gr bullets . The faster twist 7 mm cal are my most accurate rifles . The 1-9 will work with most bullets , but a faster twist will give you more options, monos and cup and core .
Lol wrong.
Why would I be wrong when Berger recommends 1-9 or faster using the 180 gr and Hammer recommends 1-8.5 using the 154 gr absolute mono . 1-8 or 1-8.5 would be better , but choose what yo like . Now tell me why I'm wrong . I'm open minded educate me .
If you want less recoil , go with tha lighter weight monos , they will perform like a heavier cup and core with more weight retention , penetration and vel , and work well in a 1-9 or faster twist rate . The 130 140 weight monos are as long as the cup and core 150 and 160 , but less recoil , especially the 120 class monos . You may or may not like monos that is a matter of preference . When I first built a 284 win I used the Hornady 120 gr hollow point and it killed well but I would not recommend it over a mono in its same weight class. The 120 grainers will reduce recoil , mono or cup and core , if that becomes a factor . Good luck , you will not be disappointed in the 284 win. Get you some good bushing dies and you will be good to go. Good luck .
I never said the 1-9 won't work , the 1-8.5 just gives some leeway , with more stability with heavy bullets.
Mine is a .235fb....Touch with the 166gr Atips is 2.500bto......If you need an OAL measurement let me know.
@Ray Gross can probably help you with everything you need to know about reamers.
