Just asking about a bullet weight or a powder really can result in really misleading answers.
You might get told about the best group, the best load or the best average but posters rarely state what they chose to express their opinions.
In addition, the data listed below shows that two Savage 6.5mm rifles have different results and have different preferences.
I would suggest you try different weights and powders with your rifle and shoot enough groups to get a statistically valid sample of each load and then concentrate on what you find works best in your rifle.
At the risk of overloading you with information, I think this long answer might give you what you need to be looking at.
Taking the average of all the groups shot with a bullet weight regardless of powder used:
I have one Savage 6.5mm CM (Model 12 LRP) that shoots 147 ELD-Ms best, then 130 TMKs & TGKs 1.6% worse and 142 SMKs slightly worse by a 8.6% margin.
123 SMKs shoot 27.1% worse.
But by individual bullet they rank as follows with increases in average group size: 130 TGK (0.0%), 147 ELD-M (4.0%), 140 ELD_M (7.2%), 130 TMK (12.3%), 142 SMK (13.4%), 140 Berger Match (16.6%), 140 Berger LR (19.6%), 140 Berger Hybrid (23.7%), 140 SMK (27%), 123 SMK (32.26%), 143 ELD-X (45.7 %).
Taking the average of all the groups shot with a particular powder regardless of bullet used, it likes IMR4451 Enduron best, IMR4350 second by 11.7%, and RL-17 next by 13.8%.
However, for the 10 best loads shot by that rifle:
The first rifle has 142 SMKs in 1st(IMR4451) & 3rd(IMR4350)
140 ELD-Ms in 2nd (IMR4350), 4th & 5th (IMR4451), 8th & 9th (IMR4451)
147 ELD-Ms in 6th (IMR4451)
130 TMKs in 10th (IMR4451)
Considering that data, how would you answer your question?
But that is only one particular rifle. Can that data match what happens with a different rifle.
Again taking the average of all the groups shot with a bullet weight regardless of powder used:
I have another Savage 6.5mm CM (Model 10T-SR) that shoots 130 TMKs better than anything else. It shoots 142 SMKs second best by 6.0%,140 ELD-Ms slightly worse by 68&%, 147 ELD-Ms by 7.8%, and 140 SMKs the absolute worst by 29.9%.
But by individual bullet they rank as follows with increases in average group size: 130 TMK (0.0%), 140 Berger Hybrid (3.2%), 130 Hornady ELD_M (3.4%), 142 SMK (6.0%), 140 Berger Match (6,1%), 140 ELD-M (6.8%), 143 ELD-X (16.3%), 140 SMK (29.9%), 140 Berger LR (40.0%)
Taking the average of all the groups shot with a particular powder regardless of bullet used,
it likes IMR4451 best, IMR4350 second by 4.0%, and RL17 third by 21.3%.
However, for the 10 best loads shot with that rifle:
The second rifle has 140 ELD-Ms in 1st (IMR4451), 2nd (IMR4350), 6th (IMR4451), 9th IMR4451) & 10th (IMR4350)
130 TMKs in 3rdth (IMR4350), 5th (IMR4451), 7th &8th (IMR4350)
143 ELD-Xs in 4th (IMR4350)
RL-17 has the 17th best load with 130 TMKs and is the only RL-17 in the top 25 loads.
I think the data shows that there is no simple answer to your question.
You'll never know what works best with your rifle until you test it.
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