Armory Sponsor
Posted: 1/3/2017 12:14:23 AM EDT
|
Happy new year guys,
I'm gearing up to start loading for my 6.5 RPR. I decided to use the Redding competition bushing neck sizing die, (the one with the micrometer on top). My question is one of bushing size selection. Can I use a new unfired factory loaded round (Hornady in this case) to get my initial measurement of the loaded neck diameter? From that measurement, I will subtract .001 or .002 (I will probably order a few in this range to try) to get the bushing size I need. Redding's tech area on their website seems to say measure from a reloaded case however I can's find anywhere they address measuring from factory ammo. Just thinking about it and it seems bullet diameter (.264) and neck area brass thickness have more to do with the desired end dimensions. Is the brass wall thickness in the neck area of a case changed much with firing? As an aside, anyone use the titanium nitride bushings over the conventional steel? Would you recommend? Thanks for your time guys. MAGA |
|
Get 1 bushing .003" smaller than a loaded factory round to start. Then order more later. Redding has exchanged a bushing for me, when i first bought the wrong one. No charge.
I use coated ones. Steel or coated bushing, both should have a bit of lube on the outside of the case neck. . Redding Type S FL sizing bushing die works for me. 
|
|
You want .001-.002 neck tension for precision 6.5 CM ammo. Most people use a bushing between .288-.290. I use a .290 and I've loaded Hornady, Barnes and Nosler ammo with it.
You can use a loaded round and subtract .001 from it. I also use the Titanium Nitride bushings. |
|
Quoted:
Is .003 what your aiming for neck tension wise? With unturned brass, i use the expander. The correct size bushing will create a very light drag from the expander. This is when using a single stage press. Using the expander means lubing the inside of the necks. No expander with neck turned brass. I neck turn for my Rem 40X, but not for my Rem 600 carbine. |
|
Neck size is brass specific, so if you change brands or brass and sometimes even different lot #'s of the same brand brass you may need to change the bushing size.
If you want .001" of neck tension you need a bushing that's -.002" under your loaded neck size. If you want .002" of neck tension you need a bushing that is -.003" smaller than the loaded ammunition's neck size. If you want .003" of neck tension you need a bushing that is -.004" smaller than the neck size and so on. The most I would consider is -.004", but that's me. It's guaranteed to work well and not work the necks too much. Be aware that any measurement you make should be in the middle of the case neck, never close to the neck shoulder junction. Brass is always thicker at the neck shoulder junction unless you turn the necks. |
Armory Sponsor