I would guess you have a 10 twist 243. The only 100 grain bullet that will stabilise in my 6mm 10 twist is the 100 grain Sierra ProHunter. Try that. Should work well.
Hi Nigel - I wish we had spoken earlier! you are correct it's a 1:10 and I have been on a real journey to some dark corners of the reloading envelope trying my hardest to find a 100g /powder combo that would stabilise. Found it last week - Pro hunter + IMR4350.
We all go on that journey from time to time. You have come out the other side with a lot more experience than you went in with!
The best and most accurate online tool that I refer to when looking at bullet suitability is the JBM calculators. It's a great website that gives things like bullet length on Hornaday bullets which seems to be the best kept secret in the world. The stability calculator allows for plastic tipped bullets which no other that I have found do, It's a great resource. My rule of thumb is that providing a bullet achieves 1.4 on their stability calculator it will work, 1.6 to 1.7 is optimal to achieve best BC and more than about 2.1 and you need to think about going longer.
http://www.jbmballistics.com/ballistics/calculators/calculators.shtml
If i remember right i was told we could'nt use home loads in shooting test, may have changed now
I understand its the rules no home loads, but two questions why and who was asked before the shooting?
Shakey
they don't know anything about the person who made them or the quality of the ammunition. They have a duty of care to protect everyone on the range so can't take risks
First and foremost congrats to all admin and members for making this a superb forum, well managed, and full of great advise and debate from supportive experienced members.
Just booked up for the BDS DSC1 in December at Essex Shooting School.
I acquired a 243 this month and starting to develop home loads and finding factory ammo that it prefers but to avoid some initial traps could use the guidance on the direction of my testing and practice (prone/kneeling/standing).
When using your own rifle for the practical:
1. SP ammo: Do you have to use factory ammo? Or are home loads accepted?
2. Does the ammo need to conform with law on For England/Wales or Scottish guidance - 1700 vs 1750ft/lbs + 100gr. I assume if course is taken in England it will follow English law?
3. Is there a restriction on the ammo to ensure its Deer legal for specific (largest) species?
4. How long is permitted for the practical test ? Is there time to a) take a barrel fouling shot/check zero?
5. Anyone else on here attending The course?
The reason for question 2 is I have not found a suitable 100gr bullet (factory ammo) as yet that groups well through 22" barrel at 100yrds.
I have avoided references to ballistic tips for obvious reasons but would interested if these are frowned upon during the practical.
Thanks in advance for your thoughts and guidance?
Get the dsctraining.org subscription. I actually felt I could have sat the test after one day in the training rooms