imr 4198 filler or no?

[Silver Fox]

I picked up a pound of imr 4198 today to try in my .303 British and 7.62x54r. Up until now I've only used 2400 and red dot. Is a filler recommended with 4198? I'm using Lyman 314299 boolits. I've read the sticky on fillers but I'd like some input from you folks all the same

[Outpost75]

If the powder charge occupies less than 70% of case capacity, or about 30 grains in the .303 case, use 1 grain of well fluffed, Dacron polyester fiber, tucked loosely under the bullet as filler. Do not push the filler down against the powder.

[Calamity Jake]

You want that dacron filler touching both the powder and bullet, NOT packed tight but touching both.

[Silver Fox]

Thank you both for the replies.

[WRideout]

It's not the same ctg, but I use 29 gr of old IMR 4198 in a 7.5 swiss, under a 173 gr Lee boolit. I don't use filler, and haven't felt the need to do so. It may be a smaller case than your .303 brit.

Wayne

[Tatume]

IMR4198 is a relatively fast burning powder, to the point that it is useful in some pistol cartridges. It is not particularly position sensitive. Unless you demonstrate a need for filler, you don't need a filler. I doubt you will find that you have such a need.

[Shiloh]

IMR4198 is a relatively fast burning powder, to the point that it is useful in some pistol cartridges. It is not particularly position sensitive. Unless you demonstrate a need for filler, you don't need a filler. I doubt you will find that you have such a need.

+1.

Shiloh

[Silver Fox]

Excellent. I've never used a filler and the thought of it freaks me out.

[Larry Gibson]

With the mass of the 314299 and the case capacity of the .303 you probably won't need nor find a filler to be beneficial, especially with loads in the 1750 - 1900 fps range.

Larry Gibson

[oldblinddog]

Excellent. I've never used a filler and the thought of it freaks me out.
Yep! +1 on that!

[leebuilder]

Me too. Had good success with 25gr under beagled 185gr lee boolit. I used toilet paper once with 3030 and cast, found it worked just as good with out.
25gr old H4198, with said beagled 185gr lee, lubed with my 45/45/10 .1
In a P14, with a new barrel
137258

[Silver Fox]

I used 1.9 cc (yes I dip for plinking loads) and had some nice results in a VKT M91. Not as nice as the group above but not bad at all.