New design NSA .30 slug accuracy?

[TDK]

Nielsen changed the base design of their .30 slugs this summer around the time of their move. I have confirmed this on at least the 47.2, 49.5 and 54.5 gr. Pics here: https://www.airgunnation.com/topic/nsa-design-change/

Old design has a bump in the center and has thicker base edges. New design the bump is gone, and base edges are thinner. I see a lot of deformities in the new base edges.

Has anyone had good luck with the new base design? So far myself and the OP in that other thread (both shooting Impacts), accuracy went from good to poor with the change. Although speeds for me are similar between the two designs, I went from about 1MOA to 2.5-3MOA, and had same results at different speeds and reg pressures. I want to hear how this change is working out for others who were already shooting the old design with success.

 

[Wr250r]

Oh no. My m3 likes the 54 . And I have one box left. Hopefully the new ones work with heavy liner.

 

[10mikemike]

I'll have to check my stock of .30 NSAs to see what generation I have.

 

[brawler1588]

Since my last post in my thread I started I did a good clean I mean good clean on my liner and I gained accuracy back still shooting slower but the potential is there for sure. The patch worm does amazing but after inspection I could still see lead buildup in the twists.

 

[Wr250r]

Yeah new nsa can't group ill keep trying 

 

[heavy-impact]

Since my last post in my thread I started I did a good clean I mean good clean on my liner and I gained accuracy back still shooting slower but the potential is there for sure. The patch worm does amazing but after inspection I could still see lead buildup in the twists.

Try giving the bore a little dab of Hi-Slip every now and then on a patch or pellet skirt. It's molybdenum disulfide in silicone grease. The moly will coat your barrel and prevent leading. Can also increase velocity a little by reducing friction.

 

[Glenn5691]

My Edgun .30 super long loves these 54.5 NSA's and shooting them at 875. 

 

[stovepipe]

Oh no. My m3 likes the 54 . And I have one box left. Hopefully the new ones work with heavy liner.

Yeah new nsa can't group ill keep trying

My FX Maverick with 700mm heavy liner (1:18 twist) liked the old NSA 54.5. Like you, I can't get the new 54.5 design to group as well.
Have you found a non-NSA 55 (ish) grain slug that works as well as the old NSA 54.5?

stovepipe

 

[Superpete]

I shoot NSA's out of my Crown, Still sitting on boxes of old design, I just don't see how that small nipple changes grouping, have you guys checked diameter, is it still same .300, can you verify that its same?

 

[Superpete]

I just ordered some slugs from NSA, going to compare them apples to apples, stay tuned...

 

[stovepipe]

I shoot NSA's out of my Crown, Still sitting on boxes of old design, I just don't see how that small nipple changes grouping, have you guys checked diameter, is it still same .300, can you verify that its same?

Hi Superpete. I used up all my old nsa 54.5 slugs and never measured the diameter with calipers. I just now measured one of the new nsa 54.5 slugs and it was 0.3005 inches. The 5/10000 is just an extra 5 that my calipers add if it's anywhere between 0.300 and 0.301.

The difference between the old and new that really got my attention is that the dished out section at the back of the new ones goes all the way to the edge of the slug -- so it's razor thin around the edges of the ass end. With the old ones, the dished out section met with a section of flat base, so it had some meat between the edge of the dish and the outside edge of the slug.

I probably shouldn't have said I can't get the new ones to group as well as the old ones since I've never shot from a proper bench setup to test. It's probably just me getting old.

stovepipe