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These velocities were taken from a 24" bull barrel .308 with Blue Dot 150gr. golden West FMJ BT, case RP, WLR, 50yd. 1. 16.9 gr. Blue Dot 1823�/sec. Alot of gas in the face. �� group. 2. 18gr. Blue Dot 1932�/sec. Sooty,3/4�group. 3. 19gr. BD 1987�/sec. Sooty �� group. 4. 19.9gr. BD 2084�/sec. Sooty �� group. 5. 20.9gr. BD 2144�/sec. Sooty, �� group. 6. 22gr. BD 2217�/sec. Sooty �� group. 7. 23gr. BD 2264�/sec. Sooty �� group. Primer just slightly flattened. 8. 23.8gr. BD 2322�/sec. 1 �� group. Primer a little more flattened, but not much. The 16.9 BD load was inadequate to build up enough pressure to seal at the necks. ALL LEAKED. | ||
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Thanks so much for the information on the 308. I am going to try some tomorrow if we get a break in the rain. David | |||
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Let us know your results,David.  roger | |||
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Hey Roger, Thank you. What was the Full Case capacity with the Blue Dot in the case you used? Thanks again and darn nice groups. | |||
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 A case full of Blue Dot was 41gr. Filled to the the junction of neck to shoulder it was 36gr.The relationship between capacity, caliber, and bullet weight will appear some day, but % capacity to the top alone has been disproved by Seafire and if someone wants to arrive at a usable rule of thumb they will have to look at a somewhat more intricate approach.As a point of interest; the velocity with 150 gr. bullets with 22gr. of Blue Dot from an 06 are the same as the same load from the .308  In a way this might be undestood if you said that with a high % of burned powder in each and starting with the same barrel length and available energy (22gr.) the resultant velocities are going to be darn close. It would seem that the difference caused by increased available capacity would be the ability to use more powder before the pressure peaks out and of course obtaining higher velocities because of the increase in energy.  Of course what do I know?  roger | |||
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Roger, In playing with this, I have found out that the longer cases, such as a 30/06 case ( 63mm) vs a 308 case ( 51 mms), is that the longer case does not seem to help the " add more powder to obtain more velocity" train of thought. Shorter cases seems to be more efficient with Blue Dot, or fatter cases ( such as a 300 Win Mag, or 300 Short Mag) than say a longer case. I have no scientific reason, just passing on observations and noticed patterns. Strangely also is that cooler primers, run higher pressures with blue dot. A large rifle primer seem to be able to hold more powder before max pressure is achieved as opposed to the use of a large pistol primer in a rifle case. Not sure why that is either. However, remember that we are working what is typically a shotgun and large caliber pistol powder, so what we hold true in regulary used rifle powders, performed differently, than Blue Dot is doing. Of course I think it was Hot Core who made the statement "that is why they call it testing" Cheers and Good shooting seafire | |||
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Quote: Hey Roger, Thank you. Obviously you "know quite a bit" about the Testing you did. That is an outstanding observation you and Seafire have made concerning the 308Win vs. 30-06 capacity and upper Pressure Indications using Blue Dot. Those are the details that aren't always obvious unless you sit back and think about what all you have seen. Through these Tests, the original "Rule of Thumb" speculated on by Seafire has proved to be a bit more difficult to define. Nothing at all wrong with that. Hey Seafire, Yes indeed, that is why it is called "Testing". ... If the weather decides to cooperate, my buddy with the 30-30 using Reduced Blue Dot Loads and I will FINALLY get to go shoot them later this week. Also have some for my 223Rem M7 and his semi-auto. We are hopeful they "won't" cycle the action on his semi-auto. Previous posts on your threads by other semi-auto users lead us to believe we won't have to chase Cases flying all over the Range. | |||
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H Core; Let me know your results with the 30/30. Believe it or not, that is the one case that I tried it in, and pronounced it as an utter failure. Maybe it was just the 30/30s that I used. Very interested in the results you gentlemen get on that one. On the other hand, I tried 15 grains of SR 4759 with a Hornady 150 grain RN bullet, what a keeper than one was ( for a 30/30, lol). Cheer and Good shooting seafire | |||
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Roger, All of your info is useful. I am glad you took the time to do the 308. I don't own one, so I could not do it. Don't own a 7/08 either if you have one of those. I have been playing with combo's of primers in this, just to thoroughly test all the possibilities. I usually use large rifle primers since they all cost the same anyway. However, I have seen where large pistol primers have tightened up groups for me. I normally only use them with downloaded handloads. I am testing the 260 Rem right now. Cheers and Good shooting seafire/propjob | |||
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